利用MODIS-GOCART气溶胶资料研究中国东部地区气溶胶直接辐射强迫

罗燕; 吴涧; 王卫国

利用MODIS-GOCART气溶胶资料研究中国东部地区气溶胶直接辐射强迫

1.
云南省气象局, 云南, 昆明, 650034;云南大学资源环境与地球科学学院大气科学系, 云南, 昆明, 650091
2.
云南大学资源环境与地球科学学院大气科学系, 云南, 昆明, 650091

基金项目: 国家自然科学研究基金(40675007);云南省自然科学基金(2005D0006M);云南大学高性能计算创新团队项目;中国气象局合作项目“气溶胶卫星遥感监测研究系统建设”共同资助

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出版历程
- 收稿日期: 2004-11-05
- 修回日期: 2006-07-26

STUDY OF THE DIRECT RADIATIVE FORCING IN EAST CHINA WITH MODIS-GOCART ASSIMILATED AEROSOL OPTICAL DEPTH

1.
Yunnan Provincial Meteorological Bureau, Kunming 650034, China;Department of Atmospheric Science, Yunnan University, Kunming 650091, China
2.
Department of Atmospheric Science, Yunnan University, Kunming 650091, China

摘要

摘要: 利用MODIS-GOCART同化的2001年逐月气溶胶光学厚度资料,在修改区域气候模式RegCM2辐射方案的基础上,连续积分5年获得平均的中国东部地区气溶胶短波和长波直接辐射效应,并通过数值试验研究了气溶胶垂直分布对辐射强迫及其气候响应的影响。结果表明:气溶胶的短波辐射效应能冷却地表、加热大气;长波辐射效应能加热地表、冷却大气;大气顶净辐射强迫年平均为-4.1W/m²;辐射强迫绝对值在春季最大,夏季次之,冬季最小;模拟区域中最大辐射强迫值主要位于华北、华南地区及四川盆地;气溶胶垂直分布是影响气溶胶辐射强迫的重要因素。总体上气溶胶层越靠近地面,大气顶辐射强迫绝对值越大,地表辐射强迫绝对值越小,大气顶辐射强迫对垂直分布较敏感;气候系统的反馈作用会放大气溶胶垂直分布对辐射气候效应的影响。
- 气溶胶光学厚度 /
- 大气顶辐射强迫 /
- 地面辐射强迫 /
- 气溶胶垂直分布
Abstract: A Regional Climate Model(RegCM2) including modified radiation transport process was used to investigate the direct radiative forcing of aerosol in East China with MODIS-GOCART assimilated aerosol optical depth of 2001, and investigate the sensitivity of radiative forcing to aerosol vertical distribution. The results show that aerosol solar effects heat the atmosphere but cool the surface. Aerosol infrared effects cool the atmosphere and heat the surface. The annual average TOA net radiative forcing is-4.1 W/m². The net direct radiative forcing is the largest in spring, becoming smaller in summer and smallest in winter. The maximum forcing is mainly in the northern, southern of China and Sichuan Basin. Aerosol vertical distribution is one of the most important factors influencing radiative forcing. The nearer to the surface aerosol layer, the larger TOA radiative forcing and the less surface forcing. Radiative forcing at the top of atmosphere is more sensible than that on the surface to aerosol vertical distribution. The climatic feedback magnifies the influence of aerosol vertical distribution on radiative and climatic effect.
- aerosol optical depth /
- radiative forcing at the top of atmosphere /
- radiative forcing on the surface /
- aerosol vertical distribution

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